Two pin fins are identical, except that the diameter of one of them is twice the diameter of the other. For which fin is the (a) fin effectiveness and (b) fin efficiency higher? Explain.
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Two pin fins are identical, except that the diameter
of one of them is twice the diameter of the other. For
which fin is the (a) fin effectiveness and (b) fin efficiency
higher? Explain.
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- Heat Transfer Consider a infinitely long pin fin with uniform Ac cross sectional area Write ef effectiveness and Af efficiencyA hot surface at 100°C is to be cooled by attaching 3-cm-long, 0.25-cm-diameter aluminum pin fins (k = 237 W/m·K) to it, with a center-to-center distance of 0.6 cm. The temperature of the surrounding medium is 30°C, and the heat transfer coefficient on the surfaces is 35 W/m2 ·K. Determine the rate of heat transfer from the surface for a 1-m x 1-m section of the plate. Also determine the overall effectiveness of the fins.150 circular copper fins (k = 400 W / m ° C) of 5 cm diameter and 1 mm thickness are attached to a pipe of 3 cm diameter and 150 cm length, the outer surface of which is kept at 220 ° C. The gap between the wings is 9 mm and the pipe is in an environment at 22 ° C. Since the heat transfer coefficient between the pipe and the ambient air is 80 W / m2 ° C, calculate the heat transfer amount from the finned pipe. Find the amount of increase in heat transfer.
- / Hot square plate (1 m ×1 m) is to be cooled by attaching aluminum circular pin fins (D=0.25 cm, L= 3 cm) distributed with distance 0.6 cm as illustrated in Figs.(1-a) & (1-b). If the fin base temperature is 100°C, cooling air temperature is 30°C and h= 35 W/m. °C. Determine the total rate of heat transfer from the finned plate and the effectiveness of the fins? Assume k= 237 W/m.°C and nr=tanh mL/ mL.The efficiency of a single cylindrical cross-section fin is 85%. The diameter of the fin is 13 mm and it extends 32 mm from the base. The base is 65 K hotter than the surrounding fluid, and the heat transfer coefficient is 32 W/m2K. How many fins would be required to increase heat transfer from the base by 50 W? Give your answer as an integer.Pin fins are provided to increase the heat transfer from a hot surface. The perimeter of each fin is 4cm and its cross section area is 2 cm². The thermal conductivity of fin material is 200 W / mK. The fin base temperature is 230 ° C, the ambient air temperature is 30 ° C and the heat transfer coefficient is 20 W / (m²K). The fins are assumed of negligible end loss Which of the following arrangements will give higher heat transfer rate? (1) 6 fins of 10 cm length. (2) 12 fins of 5 cm length
- Convective heat transfer coefficient is 15 W/(m*K), surface area of the fin is 2 m^2, the temperature at the base is 70 C and the ambient temperature is 20 C. Determine the fin efficiency if the actual heat transfer rate from the fin is 500 W? not sufficient information 66 % none of the given 15 % 33 %What do you mean by fins? What is its significance. What are its applications. Explain it by giving three examples in details. This question is based on heat transfer.A plane wall surface at 200°C is to be cooled with aluminum pin fins of parabolic profile with blunt tips. Each fin has a length of 25 mm and a base diameter of 4 mm. The fins are exposed to an ambient air condition of 25°C and the heat transfer coefficient is 45 W/m2·K. If the thermal conductivity of the fins is 230 W/m·K, determine the heat transfer rate from a single fin and the increase in the rate of heat transfer per square meter surface area as a result of attaching fins. Assume there are 100 fins per square meter surface area.
- Convective heat transfer coefficient is 15 W/(m*K), surface area of the fin is 2 m^2, the temperature at the base is 70 C and the ambient temperature is 20 C. Determine the fin efficiency if the actual heat transfer rate from the fin is 500 W?Convective heat transfer coefficient is 15 W/(m*K), surface area of the fin is 2 m^2, the temperature at the base is 70 C and the ambient temperature is 20 C. Determine the fin efficiency if the actual heat transfer rate from the fin is 500 W? A) 66 % B) not sufficient information C) none of the above D) 33 % E) 15 %12. A 3.1 cm long straight rectangular fin has a thickness of 2.7 mm. The thermal conductivity is 52 W/m K. The fin is attached to a wall maintained at 190 °C and is exposed to a convection environment at 40 °C and h- 31 W/m2 K. What is the fin efficiency? Express your answer in percent.